package com.ptu.service.impl;


import com.ptu.context.BaseContext;
import com.ptu.dto.ShoppingCartDTO;
import com.ptu.entity.Dish;
import com.ptu.entity.Setmeal;
import com.ptu.entity.ShoppingCart;
import com.ptu.mapper.DishMapper;
import com.ptu.mapper.SetmealMapper;
import com.ptu.mapper.ShoppingCartMapper;
import com.ptu.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    /**
     * 添加购物车
     * @param shoppingCartDTO
     */
    public void add(ShoppingCartDTO shoppingCartDTO) {
        //判断当前用户所加入购物车的商品是否已经在购物车里
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        shoppingCart.setUserId(BaseContext.getCurrentId());
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
            // 存在 => 更新 数量加1
        if (shoppingCartList != null && shoppingCartList.size() == 1){
            ShoppingCart shoppingCart1 = shoppingCartList.get(0);
            shoppingCart1.setNumber(shoppingCart1.getNumber()+1);
            shoppingCartMapper.updateNumberById(shoppingCart1);
        }else {
            // 不存在 => 插入  number：1
            // 1.插入的是菜品
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId!=null){
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setAmount(dish.getPrice());
                shoppingCart.setImage(dish.getImage());
            }else {
             // 2.插入的是套餐
                Long setmealId = shoppingCartDTO.getSetmealId();
                Setmeal setmeal = setmealMapper.getById(setmealId);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setAmount(setmeal.getPrice());
                shoppingCart.setImage(setmeal.getImage());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> show(Long storeId) {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();
        shoppingCart.setStoreId(storeId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        return shoppingCartList;
    }

    /**
     * 清空购物车
     */
    public void clean() {
        Long userId = BaseContext.getCurrentId();
        shoppingCartMapper.cleanByUserId(userId, null);
    }

    /**
     * 删除购物车中一个商品
     * @param shoppingCartDTO
     */
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //设置查询条件，查询当前登录用户的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);

        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
